String greeting = 'Hello' + ' ' + 'Dart!'; // "Hello Dart!" String combined = 'Hello' ' ' 'Dart!'; // 自动合并为 "Hello Dart!" 4. 字符串长度与子字符串 length:获取字符串长度。 substring(start, [end]):提取子字符串。 dart String text = 'Hello, Dart!'; print(text.length);...
You can check whether a text string contains a particular substring, at the start, end or anywhere within the text string. Either of these text strings can be text variables or text constants. The text comparison is case-insensitive.
SubstringByTextElements(Int32, Int32) 在目前 StringInfo 物件中擷取文字項目的子字串,範圍從指定的文字項目開始,一直持續到指定的文字項目數目。 SubstringByTextElements(Int32) 來源: StringInfo.cs 在目前的 StringInfo 物件中擷取文字項目的子字串,範圍從指定的文字項目開始,一直持續到最後一個文字項目。
Substring(String, Int32, Int32) Create a new String object containing the given range of characters from the source string. Substring(ICharSequence, Int32, Int32) Create a new String object containing the given range of characters from the source string. ...
以下示例使用 AppendFormat(IFormatProvider, String, Object, Object, Object) 方法演示具有整数值的布尔 And 运算的结果。 请注意,格式字符串包含六个格式项,但该方法在其参数列表中只有三个项,因为每个项采用两种不同的格式设置。 C# 复制 运行 using System; using System.Globalization; using System.Text; pu...
stringinitialString ="Initial string for stringbuilder.";intstartIndex =0;intsubstringLength =14;intcapacity =255; StringBuilder stringBuilder =newStringBuilder(initialString, startIndex, substringLength, capacity); 備註 參數capacity會定義可儲存在目前實例所配置記憶體中的字元數目上限。 其值會指派給Capacity...
string[] drives = Environment.GetLogicalDrives(); string driveNames = String.Empty; foreach (string drive in drives) driveNames += drive.Substring(0,1); // Create regular expression pattern dynamically based on local machine information. string pattern = @"\\\" + Environment.MachineName + @...
replacement can consist of any combination of literal text and substitutions. For example, the replacement pattern a*${test}b inserts the string "a*" followed by the substring that is matched by the test capturing group, if any, followed by the string "b". The * character is not ...
Appends the specified interpolated string to this instance using the specified format. Append(String) Appends a copy of the specified string to this instance. Append(String, Int32, Int32) Appends a copy of a specified substring to this instance. Append(StringBuilder, Int32, Int32) Appends...
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of either of three arguments. AppendFormat(IFormatProvider, String, Object, Object) Appends the string returned...